3221712 has 60 divisors (see below), whose sum is σ = 9715524. Its totient is φ = 990720.

The previous prime is 3221707. The next prime is 3221717. The reversal of 3221712 is 2171223.

It is an interprime number because it is at equal distance from previous prime (3221707) and next prime (3221717).

It can be written as a sum of positive squares in 2 ways, for example, as 1382976 + 1838736 = 1176^2 + 1356^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3221717) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1012 + ... + 2732.

Almost surely, 2^3221712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3221712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4857762).

3221712 is an abundant number, since it is smaller than the sum of its proper divisors (6493812).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3221712 is a wasteful number, since it uses less digits than its factorization.

3221712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1748 (or 1739 counting only the distinct ones).

The product of its digits is 168, while the sum is 18.

The square root of 3221712 is about 1794.9128112530. The cubic root of 3221712 is about 147.6937910508.

Adding to 3221712 its reverse (2171223), we get a palindrome (5392935).

The spelling of 3221712 in words is "three million, two hundred twenty-one thousand, seven hundred twelve".